14c-Cppu Uptake and Distribution in Developing Kiwifruits and Apples.

Biasi, R.S. de; Neri, D.; Sugiyama, Nobuo; Costa, Gabriely Pereira da

doi:10.17660/actahortic.1993.329.17

Cited by 10 publications

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“…In kiwifruit, high doses of TDZ increased the number of fruit with distal protuberance (Famiani et al, 1999;Schuck & Petri, 1992). The asymmetry may be overcome by more uniform distribution over the fruit surface, using uniform application of small droplets or multiple sprays at low concentration of TDZ (Biasi et al, 1993), and by avoiding treatments later after full bloom (Greene, 1995). The number of viable seeds per fruit was not affected by TDZ in both cultivars (Table 1).…”

Section: Resultsmentioning

confidence: 98%

“…TDZ, by its cytokinin-like effect, affects the direction of cell division or cell expansion resulting in more elongated apples (Elfving & Cline, 1993;Greene, 1995). The malformation in fruits treated with phenylureas seems to be the result of extremely limited mobility and redistribution of the product from the application sites, causing uneven fruit growth and misshapen (Biasi et al, 1993). In 'Gala', the percentage of asymmetrical fruit was 4% for the control treatment and higher that 50% for TDZ at doses of 10 and 20 g ha -1 (Table 1).…”

Section: Resultsmentioning

confidence: 99%

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Effect of preharvest spraying with thidiazuron on fruit quality and maturity of apples

2003

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Apple trees, cultivars Gala and Fuji, were sprayed at full bloom with thidiazuron (TDZ) at the doses of 0, 5, 10, or 20 g (a.i.) ha-1 and fruit were assessed for quality and maturity. In both cultivars, the increase of TDZ dose had detrimental effects on fruit quality, causing a reduction of fruit red surface and an increase of percentage of fruit that was asymmetrical and with calyx-end rot. TDZ caused an increment of calyx-end aperture that might have increased calyx-end rot. TDZ increased density and the length : diameter (L : D) ratio of the fruit. The number of viable seeds was not affected by TDZ. TDZ resulted in a substantial delay of fruit maturity in 'Gala' but not in 'Fuji'. TDZ also reduced soluble solids content (SSC) in 'Gala' and reduced titratable acidity in both cultivars.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Effect of preharvest spraying with thidiazuron on fruit quality and maturity of apples

2003

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“…A assimetria é atribuída à limitada mobilidade e redistribuição do produto no local de aplicação, podendo ser corrigida por aplicação uniforme de gotas pequenas ou múltiplas aplicações de TDZ a baixa concentração (Biasi et al, 1993).…”

Section: Resultsunclassified

Effects of Thidiazuron (Tdz) on Fruiting of Temperate Tree Fruits

Petri¹,

Schuck²,

Leite³

2001

Rev. Bras. Frutic.

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RESUMO -Thidiazuron (TDZ) é uma feniluréia que mostra uma atividade de citocinina, atuando na divisão celular, e conseqüentemente no crescimento e na forma das frutas em algumas fruteiras de clima temperado. A aplicação de Thidiazuron durante o período de floração em macieira, cv. Gala e Fuji, foi avaliada por um período de sete anos, nas mesmas plantas, quantificando seu efeito na frutificação efetiva, retorno de floração, tamanho e forma da fruta, maturação e outras variáveis. Também foi avaliado o TDZ em pereira e Kiwi. Em macieira, na cv. Gala, o TDZ aumentou significativamente, em todos os anos, a frutificação efetiva e o peso médio das frutas. Na média de sete anos, TDZ 10 mg.L -1 teve 112,7% de frutificação efetiva, contra 51,3% no controle. O número de cachos florais não foi afetado. O peso médio das frutas, em média, aumentou 7,0% e 18,3% para TDZ 10 mg.L -1 e 5 mg.L -1 , respectivamente. A produção por planta sempre foi superior quando aplicado TDZ, aumentando 28,7% e 41,8% para 10 mg.L -1 e 5 mg.L -1 respectivamente. O TDZ reduziu não só o número de sementes por fruta, como também o teor de cálcio na polpa das frutas e aumentou a resistência da polpa. Em pêra, o TDZ aumentou significativamente a frutificação efetiva na cv. Packam's Thiumph, e diminuiu o número de sementes por fruta. Em kiwi, TDZ 12,5 mg.L -1 aumentou o tamanho das frutas em 47,4% na cv. Monty. Termos para indexação:Thidiazuron, cálcio, TDZ, frutificação efetiva, macieira, pereira, Kiwi. EFFECTS OF THIDIAZURON (TDZ) ON FRUITING OF TEMPERATE TREE FRUITSABSTRACT -Thidiazuron (TDZ) is a phenylurea like citokinin on cell division fruit growth and fruit shape in some deciduous fruit trees. The effects of TDZ applied during flowering on apple cultivars 'Gala' and 'Fuji" were evaluated during seven growing seasons with annual applications on the same trees. The effects on pear and kiwi fruit trees were also evaluated. Every year, TDZ significantly increased fruit set and fruit weight on apple trees. The seven-year average of the fruit set from TDZ at 10 mg.L -1 was 112.7% while the control was only 51.3%. TDZ did not affect the number of clusters. The fruit weight increased 7.0% and 18.3% when the trees were sprayed with TDZ at 10 mg.L -1 and 5 mg.L -1 , respectively. TDZ also increased fruit yield per tree by 28.7% and 41.8% for the 10 mg.L -1 and 5 mg.L -1 treatments, respectively. TDZ reduced the seed number per fruit and the calcium content in the flesh fruit, but increased the fruit firmness. The fruit set increased significantly on pear cultivar Packm's Triumph treated with TDZ, and reduced the seed numbers per fruit. TDZ applied at 12.5 mg.L -1 increased fruit weight by 47,4% on "Monty" kiwi.

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“…Since CPPU is a strong promoter of cell division (Elfving and Cline, 1993) and is highly immobile (Basi et al, 1993), it may cause malformation. In the present study, as well as in a previous study with cv.…”

Section: Discussionmentioning

confidence: 99%